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11 results on '"Y. Kibe"'

1. Laboratory studies on the removal of radon-born lead from KamLAND׳s organic liquid scintillator

Author

R. D. McKeown, Hiroshi Ogawa, M. P. Decowski, Yuri Kamyshkov, D. McKee, G. Keefer, T. Miletic, Stuart J. Freedman, J. Maricic, Osamu Tajima, Z. Djurcic, K. Tamae, John G. Learned, C. E. Lane, Kunio Inoue, S. Yoshida, D. A. Dwyer, K. Tolich, Y. Takemoto, B. E. Berger, Kyo Nakajima, J. S. Ricol, M. Ogawa, B. K. Fujikawa, M. Motoki, H. Ikeda, T. Iwamoto, Yasuhiro Kishimoto, Giorgio Gratta, K. Nakajima, Lindley Winslow, K. M. Heeger, Yu. Efremenko, Sakae Takeuchi, I. Shimizu, Chao Zhang, S. Matsuno, M. Koga, Koichi Ichimura, C. Grant, Y. Koseki, S. Hatakeyama, A. Kozlov, C. Mauger, Sanshiro Enomoto, Leon Hsu, K. Furuno, Y. Kibe, Hugon J Karwowski, J. Shirai, S. Dazeley, T. Ebihara, George K. Schweitzer, J. A. Detwiler, A. Piepke, A. Suzuki, R. Svoboda, T. O׳Donnell, T. Mitsui, Hideki Watanabe, Y. Gando, D. M. Markoff, A. Gando, Hiroko Watanabe, F. Suekane, K. Nakamura, F. Piquemal, Werner Tornow, and GRAPPA (ITFA, IoP, FNWI)

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Radiochemistry, Radon Decay Products, FOS: Physical sciences, chemistry.chemical_element, Radon, Instrumentation and Detectors (physics.ins-det), Scintillator, High Energy Physics - Experiment, respiratory tract diseases, law.invention, 85-05, Nuclear physics, High Energy Physics - Experiment (hep-ex), chemistry, law, Extraction methods, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Distillation
Abstract

The removal of radioactivity from liquid scintillator has been studied in preparation of a low background phase of KamLAND. This paper describes the methods and techniques developed to measure and efficiently extract radon decay products from liquid scintillator. We report the radio-isotope reduction factors obtained when applying various extraction methods. During this study, distillation was identified as the most efficient method for removing radon-born lead from liquid scintillator.

Published
2015
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2. Direct Measurement of Backgrounds using Reactor-Off Data in Double Chooz

Author

J. Maricic, A. Hourlier, Lydie Giot, Matthew L Strait, M. Röhling, A.V. Etenko, J. Ebert, Audrey Letourneau, R. Santorelli, Janet Conrad, I. Stancu, Sebastian Wagner, Manfred Lindner, H. Furuta, Antoine Collin, Daniel M. Kaplan, R. Roncin, E. Blucher, S. Schönert, M. Franke, Ying Sun, T. Hayakawa, S. Dazeley, M. D. Skorokhvatov, Michael Wurm, H. Watanabe, T. Sumiyoshi, T. Konno, D. Kryn, F. Suekane, L.F.F. Stokes, S. Roth, C. Veyssiere, T. Hara, M. Elnimr, B. K. Lubsandorzhiev, A. Bernstein, I. Ostrovskiy, W. Potzel, Th. A. Mueller, T. Miletic, S. Habib, S. M. Fernandes, D. Shrestha, Amanda Porta, R. Gama, Z. Djurcic, E. Damon, S. Perasso, H. Miyata, G. Mention, A. Onillon, A. Cucoanes, K. Nakajima, M. Worcester, Yuri Kamyshkov, D. McKee, Stefan Schoppmann, Christian Buck, Thierry Lasserre, F. Yermia, L. Camilleri, B. Rybolt, A. Remoto, Michael Hofmann, B. White, J. Spitz, P. Novella, J. C. Barriere, C. N. Maesano, D. Dietrich, C. Mariani, T. Kawasaki, Josef Jochum, V. V. Sinev, M. Göger-Neff, P.-J. Chang, V. Durand, A. Hatzikoutelis, P. Perrin, L. Bezrukhov, F. von Feilitzsch, Marcos Cerrada, E. Caden, H. P. Lima, V. Zimmer, David Lhuillier, Lothar Oberauer, J. Reichenbacher, Yasushi Nagasaka, Anatael Cabrera, M. Toups, J. T. M. Goon, A. J. Franke, J. L. Sida, C. Aberle, J. Busenitz, Masahiro Kuze, Anna Erickson, J. M. López-Castaño, J. Haser, S. Shimojima, Muriel Fallot, T. Classen, Michael Fechner, G. A. Horton-Smith, J.V. Dawson, I. M. Pepe, P. Chimenti, C. Palomares, J. M. LoSecco, G. Keefer, T. Matsubara, C. Langbrandtner, E. Kemp, Anselmo Meregaglia, Cécile Jollet, B. Reinhold, Florian Kaether, Y. Kibe, M. Ishitsuka, E. Conover, J. Felde, D. Franco, C. L. Jones, Lindley Winslow, H. H. Trinh Thi, J. Maeda, F. Hartmann, A. Stüken, F. Sato, R. Carr, D. Greiner, I. Gil-Botella, Tobias Lachenmaier, Kazuhiro Terao, L. Goodenough, R. Milincic, Robert Svoboda, Christopher Wiebusch, G. A. Valdiviesso, A. Tonazzo, M. C. Goodman, J. C. dos Anjos, Luis González, Nathaniel Bowden, Thomas Schwetz, Achim Stahl, Yoshio Abe, M. Obolensky, G. Pronost, H. de Kerret, L. N. Kalousis, T.J.C. Bezerra, P. Pfahler, C. E. Lane, A. Osborn, M. V. d'Agostino, S. V. Sukhotin, E. Smith, N. Haag, Manuel Meyer, Marcos Dracos, S. Lucht, V. Fischer, J. Martino, M. Bergevin, K. Crum, J. I. Crespo-Anadón, Y. Sakamoto, M. H. Shaevitz, Yu. Efremenko, Caren Hagner, APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucl'eaire, Atomique et de Spectroscopie, Université de Liège, Double-CHOOZ, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Plasma Science and Fusion Center, Conrad, Janet, Jones, Christopher LaDon, Spitz, Joshua B., Terao, Yasuaki, Winslow, L., Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Particle physics, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Daya bay, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, CHOOZ, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Physics, Muon, 010308 nuclear & particles physics, Oscillation, Neutron temperature, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], 13. Climate action, High Energy Physics::Experiment, Neutrino
Abstract

Double Chooz is unique among modern reactor-based neutrino experiments studying ν¯e disappearance in that data can be collected with all reactors off. In this paper, we present data from 7.53 days of reactor-off running. Applying the same selection criteria as used in the Double Chooz reactor-on oscillation analysis, a measured background rate of 1.0±0.4 events/day is obtained. The background model for accidentals, cosmogenic β-n-emitting isotopes, fast neutrons from cosmic muons, and stopped-μ decays used in the oscillation analysis is demonstrated to be correct within the uncertainties. Kinematic distributions of the events, which are dominantly cosmic-ray-produced correlated-background events, are provided. The background rates are scaled to the shielding depths of two other reactor-based oscillation experiments, Daya Bay and RENO., United States. Dept. of Energy, National Science Foundation (U.S.)

Published
2012
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3. Reactor ν ̄e disappearance in the Double Chooz experiment

Author

G. Mention, M. Ishitsuka, Matthew L Strait, Tobias Lachenmaier, I. M. Pepe, Daniel M. Kaplan, S. V. Sukhotin, E. Smith, M. V. d'Agostino, H. Miyata, M. Kuze, E. Caden, N. Haag, Christian Buck, A. Hatzikoutelis, S. Dazeley, T. Kawasaki, E. Damon, A.V. Etenko, T. Konno, H. P. Lima, F. Suekane, L.F.F. Stokes, I. Stancu, H. Furuta, L.N. Kalousis, Yuri Kamyshkov, C. N. Maesano, Y. Sakamoto, M. Toups, T. Miletic, P. Novella, D. McKee, D. Dietrich, S. Perasso, J. Busenitz, P.-J. Chang, J. Haser, S. Shimojima, Lindley Winslow, F. Yermia, S. Lucht, G. A. Horton-Smith, Michael Hofmann, A. Bernstein, Anatael Cabrera, P. Perrin, Michael Fechner, David Lhuillier, A. Cucoanes, E. Conover, H. H. Trinh Thi, E. Kemp, Luis González, Nathaniel Bowden, Thomas Schwetz, B. White, T.J.C. Bezerra, A. Remoto, C. L. Jones, A. Onillon, C. Mariani, P. Chimenti, Kazuhiro Terao, Janet Conrad, Marcos Dracos, Josef Jochum, T. Matsubara, T. Hayakawa, I. Gil-Botella, J. Martino, L. Bezrukhov, M. Bergevin, V. V. Sinev, F. von Feilitzsch, M. Obolensky, A. Osborn, H. de Kerret, Christopher Wiebusch, M. D. Skorokhvatov, J. Ebert, Michael Wurm, H. Watanabe, Robert Svoboda, Sebastian Wagner, G. A. Valdiviesso, M. Röhling, D. Kryn, M. C. Goodman, K. Crum, Alain Letourneau, Yu. Efremenko, Manfred Lindner, Antoine Collin, E. Blucher, Zelimir Djurcic, A. Hourlier, Lydie Giot, Stefan Schoppmann, W. Potzel, Caren Hagner, J. I. Crespo-Anadón, R. Gama, Anselmo Meregaglia, M. H. Shaevitz, J. C. dos Anjos, J. M. López-Castaño, Yoshio Abe, Bayarto Lubsandorzhiev, S. Schönert, Lothar Oberauer, C. Palomares, Thierry Lasserre, G. Keefer, V. Zimmer, Muriel Fallot, T. Classen, J. C. Barriere, A. J. Franke, R. Carr, D. Greiner, P. Pfahler, C. E. Lane, L. Camilleri, Florian Kaether, Y. Kibe, F. Hartmann, J. Felde, D. Franco, J.V. Dawson, T. Sumiyoshi, A. Stahl, J. L. Sida, M. Cerrada, Amanda Porta, J. Maricic, A. Stüken, F. Sato, J. Reichenbacher, C. Veyssiere, R. Santorelli, J. Tm. Goon, D. Shrestha, J. Spitz, V. Durand, R. Roncin, Ying Sun, T. Hara, John M. LoSecco, M. Elnimr, R. Milincic, S. Roth, I. Ostrovskiy, M. Franke, Th. A. Mueller, K. Nakajima, C. Aberle, M. Worcester, Cécile Jollet, B. Reinhold, C. Langbrandtner, J. Maeda, A. Tonazzo, M. Göger-Neff, and Yasushi Nagasaka

Subjects
Physics, NOνA, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Detector, CHOOZ, 01 natural sciences, Spectral line, Nuclear physics, 0103 physical sciences, 010306 general physics, Neutrino oscillation, Electron neutrino
Abstract

The Double Chooz experiment has observed 8,249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years (reactor power x detector mass x livetime) exposure using a 10.3 cubic meter fiducial volume detector located at 1050 m from the reactor cores of the Chooz nuclear power plant in France. The expectation in case of theta13 = 0 is 8,937 events. The deficit is interpreted as evidence of electron antineutrino disappearance. From a rate plus spectral shape analysis we find sin^2 2{\theta}13 = 0.109 \pm 0.030(stat) \pm 0.025(syst). The data exclude the no-oscillation hypothesis at 99.9% CL (3.1{\sigma}).

Published
2012

4. Indication of Reactorν¯eDisappearance in the Double Chooz Experiment

Author

A. Cucoanes, F. Ardellier, M. Obolensky, M. Dracos, H. de Kerret, D. Shrestha, R. Svoboda, C. L. Jones, J. Maeda, I. Ostrovskiy, R. Santorelli, A. Tonazzo, C. Jollet, M. Franke, A. F. Barbosa, T. Hayakawa, J. Tm. Goon, I. Gil-Botella, Daniel M. Kaplan, G. Keefer, J.V. Dawson, R. Milincic, Tobias Lachenmaier, C. E. Lane, B. Guillon, J. Reichenbacher, J. Spitz, M. Worcester, N. Tamura, M. Dierckxsens, M. Cribier, J. Haser, G. Mention, H. Miyata, M. Kuze, K. Nakajima, C. Langbrandtner, J. Hartnell, Z. Sun, Christian Buck, H. P. Lima, M. Cerrada, C. Aberle, Yasushi Nagasaka, S. Cormon, Muriel Fallot, T. Classen, E. Kemp, J. Busenitz, Janet Conrad, E. Damon, S. Perasso, S. Roth, C. N. Maesano, C. Mariani, Th. A. Mueller, E. Caden, A. Onillon, W. Potzel, T. Kawasaki, D. Dietrich, Matthew L Strait, A. Hatzikoutelis, M. D. Skorokhvatov, Michael Wurm, H. Watanabe, A. Bernstein, Florian Kaether, Y. Kibe, J. Felde, Z. Djurcic, A. Osborn, A. Milzstajn, D. Franco, C. Palomares, K. Zbiri, D. E. Reyna, S. M. Fernandes, Yu. Efremenko, M. Bongrand, Ying Sun, Alain Letourneau, L. Bezrukhov, T.J.C. Bezerra, U. Schwan, Kazuhiro Terao, Yuri Kamyshkov, F. von Feilitzsch, Caren Hagner, R. Gama, Amanda Porta, H. H. Trinh Thi, T. Miletic, P. Perrin, A. Meregaglia, D. Kryn, J. Maricic, Christopher Wiebusch, J. M. LoSecco, David Lhuillier, Lothar Oberauer, Bayarto Lubsandorzhiev, B. White, P.-J. Chang, Masaki Ishitsuka, E. Falk, M. Elnimr, Thierry Lasserre, V. V. Sinev, M. Göger-Neff, H. Furuta, G. A. Horton-Smith, M. C. Goodman, F. Yermia, V. Durand, Lindley Winslow, Anatael Cabrera, F. X. Hartmann, E. Yanovitch, Y. Sakamoto, H. A. Rubin, Michael Hofmann, B. Reinhold, F. Sato, M. H. Shaevitz, Luis González, Nathaniel Bowden, Thomas Schwetz, E. Conover, H. Tabata, J. C. dos Anjos, V. Zimmer, L.N. Kalousis, M. Toups, I. M. Pepe, A. Baxter, A. Stüken, Steven Dazeley, R. Carr, D. Greiner, Yoshio Abe, L. Camilleri, Lydie Giot, M. V. d'Agostino, J. Martino, Sebastian Wagner, Manfred Lindner, Antoine Collin, E. Blucher, M. Röhling, S. Schönert, Y. Endo, P. Pfahler, M. Fechner, P. Chimenti, A.V. Etenko, T. Matsubara, J. M. López-Castanõ, I. Stancu, S. J. M. Peeters, T. Akiri, Stefan Schoppmann, D. Mckee, T. Haruna, Yehan Liu, T. Konno, A. Remoto, F. Suekane, P. Novella, T. Sumiyoshi, D. Motta, T. Hara, A. Stahl, J. L. Sida, R. Queval, M. Bergevin, J. Jochum, K. Crum, A. J. Franke, S. V. Sukhotin, J. I. Crespo-Anadón, E. Smith, N. Haag, S. Lucht, and C. Veyssiere

Subjects
NOνA, Physics, Particle physics, Muon, 010308 nuclear & particles physics, General Physics and Astronomy, Flux, Daya Bay Reactor Neutrino Experiment, CHOOZ, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, 010306 general physics, Neutrino oscillation, Electron neutrino
Abstract

The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio of events of 0.944±0.016(stat)±0.040(syst) was obtained in 101 days of running at the Chooz nuclear power plant in France, with two 4.25GWth reactors. The results were obtained from a single 10m3 fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 flux measurement after correction for differences in core composition. The deficit can be interpreted as an indication of a nonzero value of the still unmeasured neutrino mixing parameter sin⁡22θ13. Analyzing both the rate of the prompt positrons and their energy spectrum, we find sin⁡22θ13=0.086±0.041(stat)±0.030(syst), or, at 90% C.L., 0.017

Published
2012
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5. Measurement of the 8B solar neutrino flux with the KamLAND liquid scintillator detector

Author

D. A. Dwyer, Yu. Efremenko, Hideki Watanabe, Y. Gando, M. Sakai, H. Ikeda, H. M. Steiner, Hitoshi Murayama, Sandip Pakvasa, Lindley Winslow, G. A. Horton-Smith, J. G. Learned, Yuri Kamyshkov, J. A. Detwiler, K. Tamae, Y. Takemoto, T. I. Banks, A. Suzuki, K. Nakajima, D. M. Markoff, J. Shirai, M. Batygov, F. Piquemal, Yasuhiro Kishimoto, B. E. Berger, E. Yonezawa, T. Mitsui, Y. Minekawa, C. E. Lane, Koichi Ichimura, Y. Kibe, J. Maricic, A. Kozlov, R. D. McKeown, Yasuhiro Shimizu, O. Perevozchikov, A. Piepke, N. Nagai, K. Tolich, R. W. Kadel, B. D. Xu, D. McKee, C. Mauger, K. E. Downum, C. Grant, Chao Zhang, Hugon J Karwowski, Ke Han, I. Shimizu, S. Abe, A. Gando, K. Furuno, K. Narita, B. K. Fujikawa, H. Yabumoto, Stuart J. Freedman, W. Kimura, H. Takahashi, J. S. Ricol, S. Matsuno, M. Koga, M. Nakamura, Giorgio Gratta, K. Nakamura, T. O'Donnell, T. Morikawa, Kunio Inoue, Werner Tornow, Hidetomo Yoshida, T. Bloxham, Sanshiro Enomoto, S. Yoshida, F. Suekane, T. Miletic, K. M. Heeger, N. Takahashi, M. P. Decowski, G. Keefer, A. Tang, Research Center for Neutrino Science [Sendai], Tohoku University [Sendai], Department of Physics [Berkeley], University of California [Berkeley], University of California-University of California, Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Neutrino et Faibles Radioactivités (NEMO), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), KamLAND, and Other Research IHEF (IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Solar neutrino, FOS: Physical sciences, Flux, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Scintillator, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Recoil, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR), Elastic scattering, Physics, Standard solar model, 010308 nuclear & particles physics, 3. Good health, Astrophysics - Solar and Stellar Astrophysics, High Energy Physics::Experiment, Neutrino
Abstract

We report a measurement of the neutrino-electron elastic scattering rate from 8B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5 MeV analysis threshold is 1.49+/-0.14(stat)+/-0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a 8B neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77+/-0.26(stat)+/-0.32(syst) x 10^6 cm^-2s^-1. The analysis threshold is driven by 208Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic 11Be. The measured rate is consistent with existing measurements and with Standard Solar Model predictions which include matter enhanced neutrino oscillation., Comment: 6 pages, 3 figures

Published
2011
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6. Constraints on theta 13 from a three-flavor oscillation analysis of reactor antineutrinos at KamLAND

Author

R. W. Kadel, B. D. Xu, Hugon J Karwowski, J. Maricic, A. Gando, D. M. Markoff, K. Narita, K. Nakamura, J. G. Learned, C. Grant, F. Suekane, K. E. Downum, M. P. Decowski, T. I. Banks, H. Takahashi, A. Piepke, Koichi Ichimura, G. Keefer, Giorgio Gratta, K. Tamae, Y. Takemoto, S. Matsuno, Hideki Watanabe, Y. Gando, C. E. Lane, B. E. Berger, J. Shirai, J. A. Detwiler, H. Ikeda, N. Nagai, Shijun Yoshida, T. O'Donnell, Yasuhiro Kishimoto, D. A. Dwyer, Chao Zhang, T. Morikawa, M. Sakai, H. M. Steiner, Werner Tornow, Hitoshi Murayama, G. A. Horton-Smith, Kunio Inoue, A. Suzuki, O. Perevozchikov, M. Koga, K. Nakajima, T. Bloxham, M. Batygov, T. Mitsui, B. K. Fujikawa, H. Yabumoto, Y. Kibe, A. Kozlov, Yu. Efremenko, K. M. Heeger, Sanshiro Enomoto, Ke Han, Stuart J. Freedman, R. D. McKeown, Hiroshi Yoshida, T. Miletic, N. Takahashi, Y. Minekawa, Yasuhiro Shimizu, I. Shimizu, and Other Research IHEF (IoP, FNWI)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, CPT symmetry, Solar neutrino, Hadron, CHOOZ, High Energy Physics - Experiment, Baryon, Nuclear physics, Physics - Geophysics, Neutrino, Neutrino oscillation, Nuclear Experiment, Lepton
Abstract

We present new constraints on the neutrino oscillation parameters $/textyen Delta m^{2}_{21}$, $/textyen theta_{12}$, and $/textyen theta_{13}$ from a three-flavor analysis of solar and KamLAND data. The KamLAND data set includes data acquired following a radiopurity upgrade and amounts to a total exposure of $3.49 \textyen times 10^{32}$ target-proton-year. Under the assumption of {\textyen it CPT} invariance, a two-flavor analysis (/textyen mbox{$\textyen theta_{13} = 0$}) of the KamLAND and solar data yields the best-fit values $\textyen tan^{2} \textyen theta_{12} = 0.444^{+0.036}_{-0.030}$ and $\textyen Delta m^{2}_{21} = 7.50^{+0.19}_{-0.20} \textyen times 10^{-5} ~ {\textyen rm eV}^{2}$; a three-flavor analysis with $\textyen theta_{13}$ as a free parameter yields the best-fit values $\textyen tan^{2} \textyen theta_{12} = 0.452^{+0.035}_{-0.033}$, $\textyen Delta m^{2}_{21} = 7.50^{+0.19}_{-0.20} \textyen times 10^{-5} ~ {\textyen rm eV}^{2}$, and $\textyen sin^{2} \textyen theta_{13} = 0.020^{+0.016}_{-0.016}$. This $\textyen theta_{13}$ interval is consistent with other recent work combining the CHOOZ, atmospheric and long-baseline accelerator experiments. We also present a new global $\textyen theta_{13}$ analysis, incorporating the CHOOZ, atmospheric and accelerator data, which indicates $\textyen sin^{2} \textyen theta_{13} = 0.009^{+0.013}_{-0.007}$. A nonzero value is suggested, but only at the 79\textyen% C.L., Comment: 10 pages, 7 figures. Version as published in PRD. The dChi2-map and prompt energy spectrum for this analysis are available at http://www.awa.tohoku.ac.jp/KamLAND/4th_result_data_release/4th_result_data_release.html

Published
2011

7. Partial radiogenic heat model for Earth revealed by geoneutrino measurements

Author

Sanshiro Enomoto, D. A. Dwyer, B. E. Berger, M. Sakai, H. M. Steiner, Hitoshi Murayama, G. A. Horton-Smith, H. Ikeda, M. Batygov, Yasuhiro Kishimoto, D. M. Markoff, G. Keefer, Y. Kibe, A. Kozlov, Koichi Ichimura, N. Nagai, K. Nakajima, K. Tamae, B. K. Fujikawa, Y. Takemoto, Hidetomo Yoshida, H. Yabumoto, K. M. Heeger, S. Matsuno, Hugon J Karwowski, A. Piepke, K. Tolich, C. Grant, T. O'Donnell, Giorgio Gratta, T. Miletic, J. A. Detwiler, J. Shirai, A. Gando, Ke Han, T. Morikawa, Stuart J. Freedman, T. I. Banks, O. Perevozchikov, Hideki Watanabe, Y. Gando, I. Shimizu, K. Narita, N. Takahashi, H. Takahashi, R. W. Kadel, T. Bloxham, B. D. Xu, J. Maricic, R. D. McKeown, Y. Minekawa, S. Yoshida, A. Suzuki, Yasuhiro Shimizu, J. G. Learned, Chao Zhang, T. Mitsui, M. Koga, F. Suekane, Yuri Efremenko, Kunio Inoue, C. E. Lane, M. P. Decowski, K. E. Downum, K. Nakamura, Werner Tornow, and Other Research IHEF (IoP, FNWI)

Subjects
Physics, Radiogenic nuclide, Geoneutrino, Thorium, chemistry.chemical_element, Flux, Physics::Geophysics, Nuclear physics, chemistry, Heat flux, General Earth and Planetary Sciences, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Borexino, Radioactive decay
Abstract

The Earth has cooled since its formation, yet the decay of radiogenic isotopes, and in particular uranium, thorium and potassium, in the planet’s interior provides a continuing heat source. The current total heat flux from the Earth to space is 44:2±1.0 TW, but the relative contributions from residual primordial heat and radiogenic decay remain uncertain. However, radiogenic decay can be estimated from the flux of geoneutrinos, electrically neutral particles that are emitted during radioactive decay and can pass through the Earth virtually unaffected. Here we combine precise measurements of the geoneutrino flux from the Kamioka Liquid-Scintillator Antineutrino Detector, Japan, with existing measurements from the Borexino detector, Italy.We find that decay of uranium-238 and thorium-232 together contribute 20.0^(+8.8)_(-8.6)TW to Earth’s heat flux. The neutrinos emitted from the decay of potassium-40 are below the limits of detection in our experiments, but are known to contribute 4TW. Taken together, our observations indicate that heat from radioactive decay contributes about half of Earth’s total heat flux. We therefore conclude that Earth’s primordial heat supply has not yet been exhausted.

Published
2011

8. Production of Radioactive Isotopes through Cosmic Muon Spallation in KamLAND

Author

Yuri Kamyshkov, Petr Vogel, Koichi Ichimura, C. Mauger, Yohei Shimizu, C. Lendvai, J. Shirai, Frederick Gray, T. O'Donnell, Leon Hsu, T. I. Banks, S. Dazeley, D. M. Markoff, Chao Zhang, H. Ikeda, F. Piquemal, O. Perevozchikov, J. G. Learned, Sandip Pakvasa, R. D. McKeown, Sei Yoshida, B. K. Fujikawa, Kunio Inoue, K. Tamae, Lindley Winslow, Y. Takemoto, T. Miletic, K. Tolich, A. Piepke, M. Batygov, G. Keefer, M. Koga, T. Bloxham, Hugon J Karwowski, B. E. Berger, J. Maricic, Sanshiro Enomoto, David Leonard, C. Jillings, J. S. Ricol, T. Classen, K. Furuno, J. Busenitz, Kam-Biu Luk, Y. Kibe, M. Nakamura, Giorgio Gratta, A. Kozlov, A. Suzuki, S. Abe, A. Tang, M. P. Decowski, J. A. Detwiler, T. Mitsui, A. Terashima, S. Matsuno, Hideki Watanabe, Y. Gando, Yuri Efremenko, R. Kadel, E. Guardincerri, I. Shimizu, K. M. Heeger, K. E. Downum, K. Nakajima, F. Suekane, Stuart J. Freedman, W. M. Bugg, C. E. Lane, E. Yonezawa, Y. Minekawa, Yasuhiro Kishimoto, D. McKee, C. Grant, K. Nakamura, Werner Tornow, D. A. Dwyer, H. M. Steiner, Hitoshi Murayama, G. A. Horton-Smith, J. Foster, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and KamLAND

Subjects
Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Solar neutrino, FOS: Physical sciences, Cosmic ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutron, Spallation, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR), Physics, Muon, 010308 nuclear & particles physics, 96.50.S−, 96.60.−j, 24.10.Lx, 25.30.Mr, Neutrino detector, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

Radioactive isotopes produced through cosmic muon spallation are a background for rare-event detection in $\nu$ detectors, double-$\beta$-decay experiments, and dark-matter searches. Understanding the nature of cosmogenic backgrounds is particularly important for future experiments aiming to determine the pep and CNO solar neutrino fluxes, for which the background is dominated by the spallation production of $^{11}$C. Data from the Kamioka liquid-scintillator antineutrino detector (KamLAND) provides valuable information for better understanding these backgrounds, especially in liquid scintillators, and for checking estimates from current simulations based upon MUSIC, FLUKA, and GEANT4. Using the time correlation between detected muons and neutron captures, the neutron production yield in the KamLAND liquid scintillator is measured to be $(2.8 \pm 0.3) \times 10^{-4} \mu^{-1} g^{-1} cm^{2}$. For other isotopes, the production yield is determined from the observed time correlation related to known isotope lifetimes. We find some yields are inconsistent with extrapolations based on an accelerator muon beam experiment., Comment: 16 pages, 20 figures

Published
2009
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9. The KamLAND Full-Volume Calibration System

Author

B E Berger, S. J. Freedman, M. Koga, Sanshiro Enomoto, K. Owada, John G. Learned, D. A. Dwyer, Y Shimizu, T. Miletic, Chao Zhang, C. Mauger, David Leonard, Hitoshi Murayama, G. A. Horton-Smith, Yu. Efremenko, F. Piquemal, J S Ricol, M Batygov, J. Busenitz, R. D. McKeown, Sei Yoshida, A Kozlov, A. Suzuki, Yuri Kamyshkov, Giorgio Gratta, T. O'Donnell, Gilly Elor, D Syversrud, W. M. Bugg, K. Furuno, Hugon J Karwowski, L Hsu, H. Ikeda, K. Nakamura, Sandip Pakvasa, F Gray, J. Foster, J. Shirai, Michelle Galloway, S. Matsuno, S. Dazeley, J. Maricic, C. E. Lane, J. Wallig, T. Mitsui, T. Ebihara, K. M. Heeger, M P Decowski, Y. Minekawa, L. Winslow, K. Nakajima, Y. Gando, B. K. Fujikawa, Kunio Inoue, Werner Tornow, C. Lendvai, R. W. Kadel, F. Suekane, A. Piepke, Y. Kibe, K. Tamae, K. E. Downum, K. Tolich, D. M. Markoff, Koichi Ichimura, I. Shimizu, T. Classen, A. Tang, H. Steiner, G. Keefer, C. Jillings, O. Perevozchikov, A Frank, Kam Biu Luk, D. McKee, C. Grant, Yasuhiro Kishimoto, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and KamLAND

Subjects
Systematic error, sources, Physics - Instrumentation and Detectors, gas and liquid scintillators), Physics::Instrumentation and Detectors, Nuclear engineering, FOS: Physical sciences, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 29.40.Mc, 06.20.fb, 01 natural sciences, Physics::Geophysics, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Instrumentation, Nuclear Experiment, Mathematical Physics, Physics, particle-beams, 010308 nuclear & particles physics, Large detector systems for particle and astroparticle physics, Detector, Instrumentation and Detectors (physics.ins-det), scintillation and light emission processes (solid, Detector alignment and calibration methods (lasers, Control system, Scintillators, High Energy Physics::Experiment, Neutrino, Detector design and construction technologies and materials, Fiducial marker
Abstract

We have successfully built and operated a source deployment system for the KamLAND detector. This system was used to position radioactive sources throughout the delicate 1-kton liquid scintillator volume, while meeting stringent material cleanliness, material compatibility, and safety requirements. The calibration data obtained with this device were used to fully characterize detector position and energy reconstruction biases. As a result, the uncertainty in the size of the detector fiducial volume was reduced by a factor of two. Prior to calibration with this system, the fiducial volume was the largest source of systematic uncertainty in measuring the number of anti-neutrinos detected by KamLAND. This paper describes the design, operation and performance of this unique calibration system., Comment: 30 pages, 22 figures, to be submitted to JINST

Published
2009
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10. Publisher’s Note: Precision Measurement of Neutrino Oscillation Parameters with KamLAND [Phys. Rev. Lett.100, 221803 (2008)]

Author

S. Abe, T. Ebihara, S. Enomoto, K. Furuno, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, Y. Shimizu, A. Kozlov, Y. Minekawa, T. Mitsui, K. Nakajima, K. Nakamura, M. Nakamura, K. Owada, I. Shimizu, J. Shirai, F. Suekane, A. Suzuki, Y. Takemoto, K. Tamae, A. Terashima, H. Watanabe, E. Yonezawa, S. Yoshida, J. Busenitz, T. Classen, C. Grant, G. Keefer, D. S. Leonard, D. McKee, A. Piepke, M. P. Decowski, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, F. Gray, E. Guardincerri, L. Hsu, R. Kadel, C. Lendvai, K.-B. Luk, H. Murayama, T. O’Donnell, H. M. Steiner, L. A. Winslow, D. A. Dwyer, C. Jillings, C. Mauger, R. D. McKeown, P. Vogel, C. Zhang, B. E. Berger, C. E. Lane, J. Maricic, T. Miletic, M. Batygov, J. G. Learned, S. Matsuno, S. Pakvasa, J. Foster, G. A. Horton-Smith, A. Tang, S. Dazeley, K. E. Downum, G. Gratta, K. Tolich, W. Bugg, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, K. M. Heeger, F. Piquemal, and J.-S. Ricol

Subjects
Physics, Nuclear physics, Particle physics, Solar neutrino, General Physics and Astronomy, Neutrino oscillation
Published
2008
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11. Precision measurement of neutino oscillation parameters with Kamland

Author

S, Abe, T, Ebihara, S, Enomoto, K, Furuno, Y, Gando, K, Ichimura, H, Ikeda, K, Inoue, Y, Kibe, Y, Kishimoto, M, Koga, A, Kozlov, Y, Minekawa, T, Mitsui, K, Nakajima, K, Nakamura, M, Nakamura, K, Owada, I, Shimizu, Y, Shimizu, J, Shirai, F, Suekane, A, Suzuki, Y, Takemoto, K, Tamae, A, Terashima, H, Watanabe, E, Yonezawa, S, Yoshida, J, Busenitz, T, Classen, C, Grant, G, Keefer, D S, Leonard, D, McKee, A, Piepke, M P, Decowski, J A, Detwiler, S J, Freedman, B K, Fujikawa, F, Gray, E, Guardincerri, L, Hsu, R, Kadel, C, Lendvai, K-B, Luk, H, Murayama, T, O'Donnell, H M, Steiner, L A, Winslow, D A, Dwyer, C, Jillings, C, Mauger, R D, McKeown, P, Vogel, C, Zhang, B E, Berger, C E, Lane, J, Maricic, T, Miletic, M, Batygov, J G, Learned, S, Matsuno, S, Pakvasa, J, Foster, G A, Horton-Smith, A, Tang, S, Dazeley, K E, Downum, G, Gratta, K, Tolich, W, Bugg, Y, Efremenko, Y, Kamyshkov, O, Perevozchikov, H J, Karwowski, D M, Markoff, W, Tornow, K M, Heeger, F, Piquemal, and J-S, Ricol

Subjects
Physics, Particle physics, Proton, Geoneutrino, Solar neutrino, FOS: Physical sciences, General Physics and Astronomy, Geophysics (physics.geo-ph), High Energy Physics - Experiment, Nuclear physics, Physics - Geophysics, High Energy Physics - Experiment (hep-ex), Inverse beta decay, Energy spectrum, Nuclear Experiment (nucl-ex), Neutrino, Neutrino oscillation, Nuclear Experiment, Charged current
Abstract

The KamLAND experiment has determined a precise value for the neutrino oscillation parameter $\Delta m^{2}_{21}$ and stringent constraints on $\theta_{12}$. The exposure to nuclear reactor anti-neutrinos is increased almost fourfold over previous results to 2.44$\times10^{32}$ proton-yr due to longer livetime and an enlarged fiducial volume. An undistorted reactor $\bar{\nu}_{e}$ energy spectrum is now rejected at >5$\sigma$. Extending the analysis down to the inverse beta decay energy threshold, and incorporating geo-neutrinos, gives a best-fit at $\Delta m^{2}_{21}$= $7.58^{+0.14}_{-0.13}(stat)^{+0.15}_{-0.15}(syst)\times10^{-5}$ eV$^{2}$ and $\tan^2 \theta_{12}$=$0.56^{+0.10}_{0.07}(stat)^{+0.10}_{-0.06}(syst)$. Local $\Delta \chi^2$-minima at higher and lower $\Delta m^{2}_{21}$ are disfavored at >4$\sigma$. Combining with solar neutrino data, we obtain $\Delta m^{2}_{21}$= $7.59^{+0.21}_{-0.21}\times10^{-5}$ eV$^{2}$ and $\tan^2 \theta_{12}$=$0.47^{+0.06}_{-0.05}$., Comment: Version as published in PRL. Revised Fig. 2 (allowed contours) due to an error in the figure generating code (numbers or conclusions did not change). The full dChi2-map for this analysis is available at http://www.awa.tohoku.ac.jp/KamLAND/chi2map_3rdresult/chi2map.html . Fig. 3 (low E spectrum) was dropped due to space limitations

Published
2008

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